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March, 1919 THE MARINE IMAI REVIEW 25 ‘nh cc oI" Absolute Accuracy - When we state that the Sperry Gyro-Compass is absolutely ac- curate, we mean it is so unerringly true that there is no comparison be- tween it and the best magnetic com- pass that was ever conceived. The Sperry Gyro-Compass always points true north. No matter what the nature of the . cargo; no matter what the mineral or metal composition of the shore; no matter what the weather may be; in fact regardless of any possible conditions, the Sperry Gyro- Compass cannot do anything but point to _—_vncinnccAA The Home o tie 7 Sperry Gyro-Compass Altho the Sperry Gyro-Compass has been in use with telling results for a number of years by the navies of the United States and other countries, manufacturing reasons have withheld us until now from offering it for mercantile service. The principle of the Sperry Gyro-Compass jis, as its name indicates, based on the physical phenomena of the gyroscope. This principle—to recall it briefly to your mind—is that when a small gyroscope is revolved rapidly on a larger one, the axis of the smaller invariably takes a position parallel to the axis of the larger. Consequently, when the Sperry Gyro-Compass is revolved rapidly, its axis takes a position absolutely parallel to the axis of the larger gyroscope which in this case is the Earth. the true north True North, under all conditions, is the result. Just consider fora moment what this means— May we send you complete details ? no lost time due to inaccurate course; no = Gu aoe gi S CG | The ae hE ey Conner means ee _ e perry y roscop e Co. tis Lealsdpe sourvequare formats, Jae _ BROOKLYN, NEW YORK = the knowledge, the lack of which statistics = ee ee et ee onc SS i Sil 0 Please mention THE Marine REvIEW when. writing to Advertisers